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-   -   Hp525. What would u do (https://www.offshoreonly.com/forums/general-q/375457-hp525-what-would-u-do.html)

F-2 Speedy 04-18-2022 12:36 PM


Originally Posted by nocigarette (Post 4829394)
what gasket do I buy to drill the pattern any idea?

check this for your split top's 27-841234.........the 500 EFI is a standard bolt pattern

27-841234: Search Result | eBay

nocigarette 04-18-2022 12:44 PM


Originally Posted by F-2 Speedy (Post 4829396)
check this for your split top's 27-841234.........the 500 EFI is a standard bolt pattern

27-841234: Search Result | eBay


damn. Quick response. U always were a mound of knowledge I remember u answering a ton of questions back when I had my old magnum. Thanks again.

getrdunn 04-18-2022 12:52 PM


Originally Posted by nocigarette (Post 4829397)
damn. Quick response. U always were a mound of knowledge I remember u answering a ton of questions back when I had my old magnum. Thanks again.

Non relevant question but what magnum did you have - 27’? Damm I loved that haul. Cuts the waves like BOSS!

SB 04-18-2022 12:53 PM


Originally Posted by nocigarette (Post 4829394)
what gasket do I buy to drill the pattern any idea?

Exh gasket recommended for Edelbrock/GM 315cc aluminum head

Stainless marine sells a gawd awfully expensive jig /template to help. $750 i think. Doh !

F-2 Speedy 04-18-2022 12:57 PM


Originally Posted by nocigarette (Post 4829397)
damn. Quick response. U always were a mound of knowledge I remember u answering a ton of questions back when I had my old magnum. Thanks again.

Those header flanges are a pita to drill ask me how I know........:ernaehrung004:

snapmorgan 04-18-2022 01:22 PM

Probably easier to drill and tap the heads to the conventional bolt pattern

SB 04-18-2022 02:02 PM


Originally Posted by F-2 Speedy (Post 4829400)
Those header flanges are a pita to drill ask me how I know........:ernaehrung004:

Enquiring minds want to know :)

F-2 Speedy 04-18-2022 02:12 PM


Originally Posted by SB (Post 4829405)
Enquiring minds want to know :)

I drill out 2 pair of CMI sweepers to fit the AFR heads...............:faint2:........... the flange is hardened stainless

hogie roll 04-19-2022 08:51 AM


Originally Posted by nocigarette (Post 4829389)
that was my thoughts. Prolly be the fastest solution also.
wouldn’t I have to change or redrill my Cmi spit tops to fit the head configuration?

Dont fuk up those headers to fit those outdated heads. Buy brodix 298 RR or AFR 300 heads, run an edelbrock dual plane. Should make lots of torque and more power than a normal 525.

xlint89 04-19-2022 05:42 PM


Originally Posted by hogie roll (Post 4829458)
Dont fuk up those headers to fit those outdated heads. Buy brodix 298 RR or AFR 300 heads, run an edelbrock dual plane. Should make lots of torque and more power than a normal 525.

Not sure on the Brodix, but you cannot find a set of BB AFR heads for like 12 weeks. (maybe you can get the Enforcer heads, but the magnums are unobtainable).


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